#include <windows.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <cstring>
#include <string>

#define ID_GENERATE 100

#define WINDOW_X 1080
#define WINDOW_Y 1050

/*  Declare Windows procedure  */
LRESULT CALLBACK WindowProcedure (HWND, UINT, WPARAM, LPARAM);

bool DrawSometing(HDC hdc, int lines, int x = WINDOW_X, int y = WINDOW_Y){
    int a, b;
    for(int i = lines; i > 0; i--){
            srand(clock());
            a = rand()%x+1;
            b = rand()%y+1;
            LineTo(hdc, a, b);
            Sleep(1);
    }
    
    return true;
}

/*  Make the class name into a global variable  */
char szClassName[ ] = "WindowsApp";

HWND g_hGenerate;
HWND hText;
HWND hwnda;
HDC hdc = GetDC(hwnda);
//HDC hdc;

int WINAPI WinMain (HINSTANCE hThisInstance,
                    HINSTANCE hPrevInstance,
                    LPSTR lpszArgument,
                    int nFunsterStil)

{
   // HWND hwnd;               /* This is the handle for our window */
    
    MSG messages;            /* Here messages to the application are saved */
    WNDCLASSEX wincl;        /* Data structure for the windowclass */
    
    //HDC hdc;

    /* The Window structure */
    wincl.hInstance = hThisInstance;
    wincl.lpszClassName = szClassName;
    wincl.lpfnWndProc = WindowProcedure;      /* This function is called by windows */
    wincl.style = CS_DBLCLKS;                 /* Catch double-clicks */
    wincl.cbSize = sizeof (WNDCLASSEX);

    /* Use default icon and mouse-pointer */
    wincl.hIcon = LoadIcon (NULL, IDI_APPLICATION);
    wincl.hIconSm = LoadIcon (NULL, IDI_APPLICATION);
    wincl.hCursor = LoadCursor (NULL, IDC_ARROW);
    wincl.lpszMenuName = NULL;                 /* No menu */
    wincl.cbClsExtra = 0;                      /* No extra bytes after the window class */
    wincl.cbWndExtra = 0;                      /* structure or the window instance */
    /* Use Windows's default color as the background of the window */
    wincl.hbrBackground = NULL; // (HBRUSH) COLOR_BACKGROUND

    /* Register the window class, and if it fails quit the program */
    if (!RegisterClassEx (&wincl))
        return 0;

    /* The class is registered, let's create the program*/
    //hwnd = CreateWindowEx (
    //       0,                   /* Extended possibilites for variation */
    //       szClassName,         /* Classname */
     //      "Windows App",       /* Title Text */
    //       WS_OVERLAPPEDWINDOW, /* default window */
     //      CW_USEDEFAULT,       /* Windows decides the position */
     //      CW_USEDEFAULT,       /* where the window ends up on the screen */
     //      WINDOW_X,                 /* The programs width */
    //       WINDOW_Y,                 /* and height in pixels */
    //       HWND_DESKTOP,        /* The window is a child-window to desktop */
    //       NULL,                /* No menu */
    //       hThisInstance,       /* Program Instance handler */
    //       NULL                 /* No Window Creation data */
    //       );
           
    // g_hGenerate = CreateWindowEx( 0, "BUTTON", "Kliknij mnie", WS_CHILD | WS_VISIBLE, 5, 190, 150, 30, hwnd, (HMENU)ID_GENERATE, hThisInstance, NULL);
   //  hText = CreateWindowEx( WS_EX_CLIENTEDGE, "EDIT", NULL, WS_CHILD | WS_VISIBLE | WS_BORDER, 160, 190, 150, 20,
//hwnd, NULL, hThisInstance, NULL );
    /* Make the window visible on the screen */
   // ShowWindow (hwnd, nFunsterStil);
    
    //hdc = GetDC(hwnd);
    //DrawSometing(hdc, 10);
    
   hdc = GetDC(hwnda);
   for(int asd = 2147483647; asd>0; asd--)
                                         DrawSometing(hdc, 2147483647);
    
    /* Run the message loop. It will run until GetMessage() returns 0 */
    while (GetMessage (&messages, NULL, 0, 0))
    {
        /* Translate virtual-key messages into character messages */
        TranslateMessage(&messages);
        /* Send message to WindowProcedure */
        DispatchMessage(&messages);
        
        
    }

    /* The program return-value is 0 - The value that PostQuitMessage() gave */
    return messages.wParam;
}

//hwnda = hwnd;
//hdc = GetDC(hwnda);

/*  This function is called by the Windows function DispatchMessage()  */

LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    switch (message)                  /* handle the messages */
    {
        case WM_COMMAND:
             switch(wParam){
                            case ID_GENERATE:
                                 HDC hdc = GetDC(hwnda);
                                 
                                 DWORD lngth = GetWindowTextLength(hText);
                                 LPSTR Bufor = (LPSTR)GlobalAlloc(GPTR, lngth+1);
                                 DrawSometing(hdc, GetWindowText(hText, Bufor, lngth+1));
                                 for(int asd = 2147483647; asd>0; asd--)
                                       DrawSometing(hdc, 2147483647);
                                 GlobalFree(Bufor);
                                 break;
                            
                            
                            }
             break;
        case WM_DESTROY:
            PostQuitMessage (0);       /* send a WM_QUIT to the message queue */
            break;
        default:                      /* for messages that we don't deal with */
            return DefWindowProc (hwnd, message, wParam, lParam);
    }

    return 0;
}


